Bone Fixation Plate with Angled Anchor Seat
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Solution Overview
Problem
Existing bone fixation assemblies lack the ability to provide an increased angle of inclination to one side while maintaining a low profile and high stability, which is necessary for specific anatomical situations such as fractures of the hand or shoulder.
Innovation Solution
A bone fixation assembly with a seat for the bone anchor that allows up to 20° inclination relative to the vertical axis, providing a total range of motion of at least 40°, and features conical or inclined threaded holes to enable increased angulation without increasing the plate thickness, along with a locking element for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bone anchor is allowed to pivot at a large angle to one side, then the angle of inclination is improved, but the profile thickness increases
Solution Approach 1:
The hole in the plate is divided into multiple functional zones: a first zone with a first angle range and a second zone with a second angle range. This segmentation allows different angular orientations to be accommodated within the same hole structure, enabling large inclination angles without increasing plate thickness.
Solution Approach 2:
The hole is designed with asymmetric angular characteristics where the first angle range differs from the second angle range. This asymmetric design allows the bone anchor to achieve greater inclination angles in specific directions while maintaining a compact plate profile thickness.
2Adaptability or versatility
If the bone anchor is allowed to pivot at a large angle to one side, then the angle of inclination is improved, but the stability decreases
Solution Approach 1:
The plate-hole-bone anchor system is designed as a dynamic assembly that allows controlled pivoting within defined angular ranges. The locking element can be positioned to secure the bone anchor at specific angular positions, providing stability while maintaining the capability for angular adjustment during surgery.
Solution Approach 2:
The system changes the angular parameters of the bone anchor relative to the plate through the multi-zoned hole design. By allowing the bone anchor to pivot within specific angular ranges defined by the different zones, the system achieves both adaptability for various angles and stability through controlled positioning.
3Adaptability or versatility
If the plate thickness is increased to provide greater angular range, then the angle of inclination is improved, but the profile becomes thicker
Solution Approach 1:
Instead of increasing plate thickness, the hole is segmented into multiple angular zones that accommodate different inclination angles. This allows a thin plate to provide a wide angular range by organizing the pivot capability spatially within the hole structure rather than increasing material thickness.
Solution Approach 2:
The solution moves from a single-dimension approach (increasing plate thickness) to a multi-dimension approach by creating different angular zones within the hole. This allows the plate to achieve greater angular range through spatial arrangement rather than increased thickness.
Data Source
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AI summary
A plate member assembly is provided for use in orthopaedic or trauma surgery. The plate member assembly includes a plate member (200) having a top side (201a) and a bottom side (201b) with at least one passage (202) extending therethrough. The at least one passage (202) includes a first bore (202a) with a first end open towards the top side (201a), a seat portion (202c) configured to receive the head (7) of the bone anchor, and a second bore (202b) open towards the bottom side (201b). The first bore (201a) comprises a first central axis (C1) and the seat portion (202b) comprises a second central axis (C3). The anchor can be angled within the seat portion (202c) relative to the second central axis (C3). Recesses (230, 232) are provided at the first bore (202a) and second bore (202b) to permit the bone anchor (6) to be further angled in a favored direction relative to the second central axis (C3).